These Lange 1s -- with PT case, rhodium dial, applied markers, and blue hands -- don't have their own reference number and came about in a variety of ways, mostly pre-Richemont. Some were made to order in the factory (certainly by Cellini and perhaps by other ADs back in the 1990s/early 2000s), while others had the hands swapped later, when Lange still permitted such customizations. You can find quite a few other examples like this -- e.g., we've seen Langematiks and 1815 chronos with blue steel hands that "should" have gold hands, etc., again without their own unique reference numbers. The blue-handed Stealth is one of the more common examples.
A thought experiment: Let's pretend that Lange parts (hands, etc.) were more readily available on today's open market, so that owners could make these modifications anytime, by themselves, without Lange's help or permission. Would we call these "Frankenwatches" and look down upon them (unless the owner also kept the old/original set of hands as spares)? Or would we not care? This message has been edited by CR on 2016-08-01 20:34:41